Fuel production equipment—units to turn the water of the Moon and Mars into rocket fuel, breathable oxygen, and drinkable water,

Units to turn the carbon dioxide in Mars' atmosphere into plastics,
graphene, and carbon fiber with which 3-d printers can build more
habitats, tools, and rovers—more trucks, SUVs and dune buggies.

Units to turn the rusty rocks lying around on the Martian surface into high strength steel for habitats.

'Why move NASA into space highway construction? Because no one else
will do it. And our future in space depends on it. Our future share in a
space economy that United Launch Alliance (a joint venture rocket
company from Boeing and Lockheed Martin) estimates will be worth $2.7
trillion in thirty years.'